Other Parts Discussed in Thread: BQ20Z65-R1, , BQ40Z50-R2
Working on a device that has batteries using the bq20z45-R1 and the bq20z65-R1. Have a couple of questions that I cannot find how the AFE operates for exiting and entering Ship Mode.
1) Exiting Ship Mode
How long does it take the AFE to wake and need to see the pack voltage at or greater than the Charger Present voltage?
The current batteries define the Charger Present voltage a 3.00 V and the AFE wake at 5.00 V?
- How long does the AFE take to wake (and defined spec?)
- How long does voltage at the terminal need to be present to wake the AFE and have the AFE exit Ship Mode? (any minimum time spec?)
2) Entering Ship Mode
Had a situation where there was voltage leakage to the battery from the device (~ 5.5 V). The battery defined the Ship Mode Delay as 5 seconds.
When commanding the battery to Ship Mode (2-consecutive Manufacturing Access Shutdown commands), the battery after 5-seconds would trip the FETs (i.e. voltage dropped from 16 V to the leakage voltage of 5.5 V).
Due to the Leakage, the AFE did not lose power, thus after the second delay of 5 seconds, the battery was not fully in Ship Mode, but while the leakage voltage was present, the battery FETs remained OFF. After ~4.5 minutes, the battery would recover on it's own, i.e. FETs enabled and the voltage would jump up to the battery 16 V.
Not specified in the documents, but does the AFE have a timeout when trying to enter Ship Mode? If the voltage never dropped below 5 V to bring down the AFE, does the AFE keep the FETs tripped but has a internal timeout of ~4.5 minutes to restore the FETs since the voltage did not drop below the Charger Present (3 V)?
Just trying to under stand what the fuel gauge / AFE is doing here?
Thanks,
Don ...
